Monday, December 17, 2007

Whats Ur PageRank...

Monday, December 17, 2007
I recently asked my buddy what is our page rank and I found out that I had misinterpreted the whole thing so I decided to check it myself. PageRank is a link analysis algorithm that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the World Wide Web, with the purpose of "measuring" its relative importance within the set. PageRank was developed at Stanford University by Larry Page (hence the name Page-Rank) and later Sergey Brin as part of a research project about a new kind of search engine.

The scale for PageRank is logarithmic like the Richter Scale and roughly based upon quantity of inbound links as well as importance of the page providing the link.Google assigns a numeric weighting from 0-10 for each webpage on the Internet; this PageRank denotes your site’s importance in the eyes of Google.It is a probability distribution used to represent the likelihood that a person randomly clicking on links will arrive at any particular page. A probability is expressed as a numeric value between 0 and 1,a 0.5 probability is commonly expressed as a "50% chance" of something happening. Hence, a PageRank of 0.5 means there is a 50% chance that a person clicking on a random link will be directed to the document with the 0.5 PageRank.

In the general case, the PageRank value for any page 'u' can be expressed as:

i.e. the PageRank value for a page 'u' is dependent on the PageRank values for each page 'v' out of the set Bu (this set contains all pages linking to page u), divided by the number L(v) of links from page 'v'.Google recalculates PageRank scores each time it crawls the Web and rebuilds its index,as Google increases the number of documents in its collection, the initial approximation of PageRank decreases for all documents.

Listed below are sites said to have the highest page rank 10. - Adobe Systems, software company. In addition, several dozen pages on this domain are PR10. - Apache Software Foundation, open-source software - Apple Computer - Cisco Systems
CSAIL - MIT's Computer Science and Artificial Intelligence Laboratory - United States Department of Energy - European Research Consortium for Informatics and Mathematics - Google, search engine that assigns PageRank - Keio University, Tokyo, Japan - International Business Machines, computer technology corporation - Macromedia, software company - Microsoft Corporation, computer software company
MIT - Massachusetts Institute of Technology - NASA, U.S. government agency for the space program and aerospace research - National Science Foundation, U.S. government agency for scientific research - RealPlayer, music, video, games - tracking service - World Wide Web Consortium - The White House

The main disadvantage is that it favors older pages, because a new page, even a very good one, will not have many links unless it is part of an existing site.

1 comments: said...

my page rank is 3, but redirected page was PR 0... too bad google give me like that